I have noticed a lot of people visiting this blog looking for Non-Mainland China produced vitamin C. To help you out, I’d a little searching of my own. It is rather difficult to find products labeled that extensively. I did not find much. But below are two options to help you in your search.
Life Extensions is one brand I’m familiar with that listed on their site “No Chinese vitamin C is permitted in Life Extension brand vitamin C.”
DSM of Scotland (formerly Roche Vitamins) also claims to have non Chinese vitamin C. I am not familiar with this brand, but click on the name and read their article about their product.